@Article{ VILLEGAS_RUIZ_GUTIERREZ:279-308,

author = { JOSÉ LUIS VILLEGAS CASTELLANOS and FRANCISCO RUIZ FERRON and JOSE GUTIERREZ PEREZ } ,

title = { REPRESENTATIONS IN PROBLEM SOLVING A CASE STUDY WITH OPTIMIZATIONS PROBLEMS },

journal = { ||ELECTRONIC JOURNAL OF RESEARCH IN EDUCATIONAL PSYCHOLOGY|| },

year = { 2009 },

volume = { 17 },

issn = { 1696-2095 },

pages = { 279-308 },

doi = { http://www.investigacion-psicopedagogica.org/revista/new/english/contadorarticulo.php?297 },

}